1. Microwave filtering
An ideal filter device is one that achieves perfect transmission for all frequencies within the passband and infinite attenuation in the cut-off bands. Such ideal characteristics cannot be achieved in practice, and the aim of a filter designer is to approach these ideal constraints as closely as possible, while accepting a certain tolerance.
The working frequencies of the filters currently in production are extremely wide. .
Filters can be divided into three categories:
low-pass filters which transmit all signals with frequencies between zero and a certain limit frequency f c , with frequencies above f c being attenuated;
high-pass filters which pass...
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Microwave filtering
Electromagnetic cavities
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